• a : Commencement of atrial contraction, affecting the ventricular septum and the posterior wall
• b : Point of maximum effect of atrial contraction on the left ventricle (LV)
• c : Closing of the mitral valve
• d : Onset of movement of VS, towards its position in systole
• e : Onset of movement of the posterior wall, towards its systolic position
• f : First systolic maximum of VS, in the direction of LV
• g : Onset of the renewed systolic movement of VS in the direction of LV, which is simultaneous with the closing of the aortic valve
• h : Point of maximal thickness of the posterior ventricular wall
• i :Second systolic maximum of VS, in the direction of LV
• j : End of the fast relaxation (thickness reduction) phase of the lateral posterior wall of LV
• k : End of the fast relaxation (thickness reduction) phase of VS